Apr 20, 2014

D.C Shunt Generator


A shunt-excited generator is a machine whose shunt field coil is linked in parallel with the armature terminals, in order that the generator will be self-excited. The principal advantage of this affiliation is that it removes the need for an external supply of excitation.

How is self-excitation achieved?

When a shunt generator is in full swing up, a little voltage is induced in the coil, due to the remaining flux within the poles. This voltage produces a tiny low exciting current IX within the shunt field. The ensuing little mmf acts in a similar direction as the remaining flux, inflicting the flux per pole to extend. The redoubled flux will increase E0 that will increase IX, that will increase the flux still a lot of, that will increase E0 even a lot of, and then forth. This progressive buildup continues till E0 reaches a most worth determined by the sector resistance and also the degree of saturation. Schematic diagram of a shunt generator is shown below. In this a shunt field is one designed to be connected in shunt (alternate term for parallel) with the armature winding.


Controlling the Voltage of a Shunt Generator


It is straightforward to management the induced voltage of a shunt-excited generator. We have a tendency to merely vary the exciting current by suggests that of a resistance connected in series with the shunt field.
The equivalent circuit of a generator is therefore composed of a resistance Ra asynchronous with a voltage E0.

The latter is that the voltage evoked within the revolving conductors. Terminals 1 & 2 are the external armature terminals of the machine, and F1, F2 are the Field winding terminals.


Read Comment Policy
We have Zero Tolerance to Spam. Chessy Comments and Comments with Links will be deleted immediately upon our review.

  1. Thank you for this informative blog. For further information 4k over the air visit our website.